Re: undo changes

There could some possibilities when this tool might not work. For example you deleted some item and then made change. It might not get undone. Also, as per the help center reference, you can undo the changes going back to the past 30 days window. More details here: https://support.google.com/adwords/answer/2454137?hl=en

Re: undo changes

In order to do that, first click on the particular campaign where you want to undo changes and then click on View Change History. Doing this will give you the changes history for that particular campaign and you can undo the changes whatever you want. To cross check, Change History Tool shows on Top Left the name of the campaign where you are in the Change History.

Re: undo changes

There could some possibilities when this tool might not work. For example you deleted some item and then made change. It might not get undone. Also, as per the help center reference, you can undo the changes going back to the past 30 days window. More details here: https://support.google.com/adwords/answer/2454137?hl=en